The device used to show the result produced by the computer is called an output device. output device produces either hardcopy or softcopy output. the output in printed form is called hardcopy output. it is permanent in nature whereas softcopy device is not permanent in nature. the output shown on the monitor is an example of softcopy output. the commonly used output devices are monitors, printers, plotters, speakers, headphones, projector etc.
Monitors are the most commonly used output device today which are commonly used to produce soft copy output from the computer. The monitor is similar to the television screen. there are two basic types of monitors: CRT(cathode ray tube) monitors and LCD(liquid crystal display) monitors.
The printer is the most commonly used output device to produce a hardcopy output. They are generally used to plot images and documents into a paper. According to the technology used by a printer, it can be classified into two broad categories: impact and non-impact printer. Impact printer uses electromechanical technology whereas non-impact printer uses spraying technology for printing a document.
The plotter is the output device similar to the printer which is used for the purpose of printing vector graphics. Plotter interprets command from a computer in sequence manner and draws a line on paper according to the command given to it.
Speaker is the commonly use audio output device. the main purpose of speaker is to produce audio output that can be heard by listener. Speaker converts analog audio signals into the equivalent air vibrations to make audible sound which can be listened by peoples.
Headphones are the pair of small loudspeaker drivers used over a user’s ears. They are also an output device similar to the speaker which converts analog audio signals into the equivalent air vibrations to make an audible sound which can be listened by peoples. They are generally connected to electronic devices such as laptop, phone to produce sound.
A projector is a commonly used optical output device that projects an image or moving image into a projection screen. projector is generally used with laptop or desktop computers. projector with computer is used in classroom for showing slides, pictures, videos etc.